JPS62103125A - Manufacture device for snow-damage-resisting insulated wire - Google Patents

Abstract

PURPOSE:To manufacture continuously a snow-damage-resisting insulated wire on an insulating coating of which beams have been provided spirally, by a method wherein a die is constituted of a die body on a land of which a plurality of recessed grooves, which is in a longitudinal direction and extending to the tip of the land, is provided and a die case and the die body is inserted into the die case turnably and possesses a function turning in harmony with extrusion molding speed of the wire. CONSTITUTION:Two lines of lengthwise recessed grooves 15 extending to the tip of a land 14 are formed on the land 14 of a die body 8 symmetrically about a land axis, the recessed groove 15 is tilted forwardly in a turning direction of the die body 8, a degree of an inclination of which is made into a direction of a synthetic vector between an extrusion speed of a compound (a) and a turning speed of the die body 8. When the compound (a) and a conductor 21 are sent into a died 5 respectively from a crosshead 1 and nipple 4 under a state that the die body 8 is being rotated, an external circumferential surface of the conductor 21 is coated 22 with the compound (a) within the die body 8 and two beams 23a, 23b are formed spirally on an external circumferential surface of an insulated coating 22. In other words, a snow-damage- resisting insulated wire is molded through extrusion continuously.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an apparatus for manufacturing overhead insulated wires, particularly snow damage-resistant insulated wires.

[Conventional technology and its problems]

What has been used so far as snow damage-resistant insulated wire,
As shown in FIG. 3, two fins 3 are formed on the surface of the insulated wire 31.
2 are provided continuously in the length direction.

When this snow damage-resistant insulated wire is strung over a utility pole, wind pressure concentrates on the fin 32, which receives wind pressure.As a result, the strung wire sways, vibration load concentrates on the clamp portion of the wire, and the wire eventually breaks. It contains a lot of danger.

In an attempt to solve this problem, Utility Model Application No. 58-204326 (Utility Model Application No. 60-112020) was published as follows: "Two fin-like bodies 4 provided oppositely in the length direction of the electric wire 41" as shown in FIG.
A fin removal portion 43 is formed on the fin removal portion 2, and the length l of the removal portion 43 is
5 fi to 100 n or less. However, in order to manufacture this snow-damage-resistant insulated wire, the finned insulation coating, which is originally continuously extruded, must be cut and removed by some method after extrusion to form the removed portion 43. In reality, this cutting and removal is extremely difficult, and even if it were possible to cut and remove it, it would be nearly impossible to make the surface of that part smooth.

If the surface of the cut and removed portion cannot be made smooth, dust is likely to adhere to that portion during the span, and as a result, there is a possibility that a tracking phenomenon may be induced and dielectric breakdown may occur.

Therefore, as shown in FIG.
A snow damage-resistant insulated wire has been devised in which a plurality of protrusions 23a, 23b are spirally provided on the outer surface of the insulation coating 22 in the length direction.

In this electric wire, the snow that has fallen on the wire surface is
a and 23b prevent the electric wire from sliding downward on the surface, and when a certain amount of snow falls, it loses its balance and falls away from the electric wire, so that the electric wire is prevented from accreting snow.

Further, since the protrusions 23a and 23b are spiral-shaped, the wind flows along the protrusions 23a and 23b, and the wind flows along the protrusions 23a and 23b.
Wind pressure does not concentrate on 23b, and therefore the electric wire is less likely to sway.

Furthermore, since the protrusions 23a and 23b can be continuous, continuous molding is possible, and both surfaces of the wire can be made smooth, so dust does not adhere to them and the tracking phenomenon is not induced. There's no need.

[Purpose of the invention]

An object of the present invention is to provide an apparatus for manufacturing the electric wire shown in FIG.

[Means to achieve the purpose]

In order to achieve the above object, in the apparatus of the present invention, a nipple holder and a die holder are provided in the crosshead of an extrusion molding machine, and a nipple is attached to the nipple holder, and a die is attached to the die holder. In the manufacturing device, the die includes a die body and a die case, the die body having a plurality of longitudinal grooves extending to the tip of the land, and a die case, and the die body is rotatably fitted into the die case, and It was designed to have the function of rotating in synchronization with the extrusion speed of the electric wire.

[Effect]

In the apparatus of the present invention configured as described above, when extruding an insulating coating, a plurality of protrusions are formed on the insulator by the compound pressed from the tip of the groove provided in the die land, and Since the die rotates in synchronization with the extrusion molding speed of the electric wire, the protrusions become spiral-shaped, and the electric wire shown in FIG. 2 is continuously formed.

The lead of the protrusion is determined by the rotational speed of the die, and the rotational speed is appropriately determined through experiments to prevent the wind pressure from concentrating (and to prevent the fallen snow from sliding downwards).

In addition, if the concave groove is inclined forward in the rotational direction with respect to the length direction, and that direction is the direction of the composite vector of the rotational speed of the die and the compound extrusion speed, no rotational force will be applied to the compound in the concave groove, and the compound will be smooth. is extruded.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 of the drawings.

1 is the crosshead of the extrusion molding machine, and this crosshead 1
is provided with a nipple holder 2 and a die holder 3, the nipple 4 is attached to the nipple holder 2, and the die holder 3 is attached to the nipple holder 2.
A die 5 is attached to each of the dies 5 by bolts 6 such that the dies 5 can be aligned with each other. The die 5 consists of a die case 7 and a die body 8. The die body 8 is rotatably fitted into the die case 7, a gear 9 is fixed to the die body 8 by a key 10, and a pinion is connected to the gear 9. 11 meshes,
The shaft 12 of the pinion 11 is directly connected to a drive source 13, and the die body 8 is rotated by the drive source 13 via the pinion 11, gear 9, etc.

In the land 14 of the die body 8, two longitudinal grooves 15 extending to the tip thereof are formed symmetrically with respect to the land axis, and the grooves 15 are inclined forward in the direction of rotation of the die body 8.
The degree of inclination is in the direction of the composite vector of the extrusion speed of compound a and the rotational speed of the die body 8. Groove 15
The number of lines is appropriately determined to be two or more.

The embodiment is constructed as described above, and when the compound a is fed from the crosshead 1 and the conductor 21 from the nipple 4 to the die 5 while the die body 8 is rotating, the inside of the die body 8 is fed. The compound a is coated 22 on the outer peripheral surface of the conductor 21, and the compound a extruded from the tip of the groove 15 coats the insulation coating 22.
Two protrusions 23a and 23b are formed in a spiral shape on the outer peripheral surface of 2. That is, the snow damage-resistant insulated wire shown in FIG. 2 is continuously extruded.

In this embodiment, the die body 8 is driven by a gear 9 or the like, but it goes without saying that other known driving methods can be adopted as desired.

〔effect〕

According to the manufacturing apparatus for snow-damage-resistant insulated wires as described above, it is possible to continuously manufacture snow-damage-resistant insulated wires in which protrusions are provided in a spiral shape on the insulation coating in an extremely simple manner, which has industrial utility value. It has a high value.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of an embodiment of a snow damage-resistant insulated wire manufacturing apparatus according to the present invention, FIG. 2 is a perspective view of a snow damage-resistant insulated wire manufactured by the apparatus of the present invention, and FIG. 3 is a conventional An explanatory diagram of an example of a snow-damage-resistant insulated wire, FIG. 1...Cross head, 2...Nipple holder, 3...Dice holder, 4...
Nipple, 5... Dice, 7... Dice case, 8... Dice body, 9...
Gear, 11...Pinion, 13...
Drive source, 14...land, 15...concave groove. Patent Applicant: TAC Electric Cable Co., Ltd. Agent: Kama 1) Text Part 2, Figure 4, Figure 1-----\-------------Figure 2, Figure 4 □ ('b)

Claims (2)

[Claims] (1) In an electric wire manufacturing apparatus in which a nipple holder and a die holder are provided in the crosshead of an extrusion molding machine, a nipple is attached to the nipple holder, and a die is attached to the die holder, the die is attached to a land with a length extending to its tip. Consisting of a die body with a plurality of horizontal concave grooves and a die case, the die body is rotatably fitted into the die case and has the function of rotating in synchronization with the extrusion molding speed of the electric wire. A manufacturing device for snow-damage-resistant insulated wires featuring: (2) The apparatus for manufacturing a snow damage-resistant insulated wire according to claim 1, characterized in that the groove provided in the land of the die body is inclined forward in the direction of rotation with respect to the length direction.